

public class BianLiang {
    
public static void main(String[] args) {

    // 1. 变量名不能重复被定义
    int a = 1;
    System.out.println(a);
    long ab =12;
    System.out.println(ab);
    // 2. 变量需要被初始化  The local variable c may not have been initialized
    int c=10;
    System.out.println(c);
    // 数据类型 int 


}

      
    
}
